If you describe someone as a turncoat, you think they are disloyal or deceitful, because they have left their party or organization and joined an opposing one.

Is turncoat an insult?

A turncoat is a traitor. … Turncoat comes from the ancient practice of wearing a badge or pin on one's coat signifying the party or leader you supported. ... Turncoat is worse: it implies no possibility of any good or honest motive. Defector can at least sometimes have a neutral or even positive implication.

What is a turncoat slang?

A turncoat is a person who shifts allegiance from one loyalty or ideal to another, betraying or deserting an original cause by switching to the opposing side or party.